This replica prop is from Star Trek VI The Undiscovered Country, Klingon restraints
were used to escort Kirk and McCoy into Klingon custody after the death
of Klingon Chancellor, Gorkon. (See screen shots above.)

These restraints are approximately 8 7/8 inches wide and approximately 4 inches tall.
They are about 1.5 inches in thickness
Restraints can open and close, stick together using imbedded
Neodymium magnet to stay closed.
Hand holes are about 2 3/4 inches in diameter
Cuffs weigh about 10 oz.